A playground merry-go-round spins about its axis with negligible friction. A child moves from the center of the merry-go-round to the rim. For this system, indicate which of the following quantities change.
A. Potential energy
B. Angular momentum
C. Mass
D. Moment of inertia
E. Angular speed
F. Rotational kinetic energy
Answer:
B
Explanation:
In this process on merry go round there is not any external torque so angular momentum will be conserve. Mass is always conserved.
For water, which takes more energy, melting or evaporating?
Answer:
melting
Explanation:
that works best
How are the oscillating magnetic and electric fields of an electromagnetic wave positioned relative to each other?
A) They are parallel to each other.
B) The magnetic field is rotated 45° from the electric field
C) the electric field is rotated 45° from the magnetic field.
D) They are perpendicular to each other
Answer:
D.
for the scalar product between two vectors to be 0 either one of thm is zero vector or they are perpendicular to each other
You push a shopping cart for fun with a force of 60N. If the shopping cart has a mass of 12kg, what is the
acceleration of the cart?
Answer:
[tex]\huge\boxed{\sf a = 5 \ ms^{-2}}[/tex]
Explanation:
Given:
Force = f = 60 N
Mass = m = 12 kg
Required:
Acceleration = a = ?
Formula:
F = ma
Solution:
Rearranging formula
a = F / m
a = 60 / 12
a = 5 ms⁻²
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807Peace!plsss helpp will give brainliest! thanks! :)
Answer:
1. Limiting Factors.
2. Cardiovascular Fitness.
3. Muscular Fitness.
4. Obese.
5. Flexibility.
6. Physical Fitness.
7. Regular Exercise.
Explanation:
There isn't really an explanation for this but please give brainliest if this helped you!
Answer:
I agree with him even though I don't understand anything
A moose runs through the woods and covers 825 m North in 118 s. What is the average velocity of the moose?
Average Velocity=Total Displacement/Total Time
[tex]\\ \sf\longmapsto Average\: Velocity=\dfrac{825}{118}[/tex]
[tex]\\ \sf\longmapsto Average\:Velocity\approx 8m/s[/tex]
1. What distances can you be certain of on the ruler in Model 1?
Answer:
Zero cm and 10 cm......
if my answer helps you than mark me as brainliest
what is the law of conservation of Momentum?
Answer:
Conservation of momentum, general law of physics according to which the quantity called momentum that characterizes motion never changes in an isolated collection of objects; that is, the total momentum of a system remains constant
what is a risky behaviour
Explanation:
Doing homework is risky behaviour broo
the distance between neha and diya's house is 200 km. a car take 2 hours to cover this this distance. find the speed of the car.
Answer:
27.8m/s
Explanation:
V= d/t
S. I unit of distance (displacement) is m
S. I unit of time is seconds
V= d/t
V = (200 x 1000)m / (2 x 60 x 60)s
V= 27.8 m/s
Metallic bonds are responsible for many properties of metals, such as conductivity. Why is this possible?(1 point)
Metals have low electronegativity, so they are conductive because they pass charges easily.
Metals have low electronegativity, so they are conductive because they pass charges easily.
Two metals bonded together are going to be more conductive than a metal bonded with a nonmetal.
Two metals bonded together are going to be more conductive than a metal bonded with a nonmetal.
An attraction between a positive charge and a negative charge is created.
An attraction between a positive charge and a negative charge is created.
The bonds can shift because valence electrons are held loosely and move freely.
Conductivity is possible in metals because metallic bonds can shift due to the fact that valence electrons are held loosely and move freely.
WHAT ARE METALLIC BONDS:
Metallic bonds are bonds that holds metals together. In metallic bonding, electrons are shared between positive metal ions. The electrons that flow in metals are delocalized, hence, are able to move freely. These free moving electrons are responsible for the high conductivity that metals exhibit.Therefore, conductivity is possible in metals because metallic bonds can shift due to the fact that valence electrons are held loosely and move freely.
Learn more: https://brainly.com/question/14442883
valence electrons are held loosely and move freely.
Explanation:
seharitat -The distance of a panet from the earth is 2.5 x 10^7 km and the gravitational force between them them is 3.82 x 10^18 N. Mass of the planet and earth are equal, each being 5.98 x 10^24 Kg. Calculate the universal gravitation constant.
We know
[tex]\boxed{\sf F=G\dfrac{Mm}{r^2}}[/tex]
[tex]\\ \sf\longmapsto G=\dfrac{Fr^2}{Mm}[/tex]
[tex]\\ \sf\longmapsto G=\dfrac{3.82\times 10^{18}(2.5\times 10^7)^2}{(5.98\times 10^{24})^2}[/tex](M=m)
[tex]\\ \sf\longmapsto G=\dfrac{3.82\times 10^{18}(6.25\times 10^{14})}{35.7\times 10^{48}}[/tex]
[tex]\\ \sf\longmapsto G=\dfrac{23.87\times 10^{32}}{35.7\times 10^{48}}[/tex]
[tex]\\ \sf\longmapsto G=0.668\times10^{-16}[/tex]
[tex]\\ \sf\longmapsto G=6.68\times 10^{-15}[/tex]
NEED HELP ASAP What are the lengths of the x and y components of this vector?
Explanation:
the lengths of the x and y components of the vector :
the x- Component:
Vx = 12×cos72° = 12× 0.3090 = 3.708
the y-component:
Vy = 12×sin72° = 12× 0.9510 = 11.412
-
x-component
= 12 . cos 72
= 12 . 0,3090
= 3,708
y component
= 12 . sin 75
= 12 . 0,9510
= 11,412
#mathisfun
On earth, the acceleration due to gravity is (A. 32 ft/sec2
B. 60 miles/hour).
Who has the greater velocity, an astronaut who has just completed an orbit of the Earth or you when you have just traveled from home to school? Explain.
Answer:
the answer is
Explanation:
constant acceleration
because when the object's velocity is changing then the object is accelerating or decelerating
as acceleration describe changing of velocity so the answer is constant acceleration
Acceleration is defined as the rate of change of velocity.
Acceleration = (Change in velocity) / time taken
Acceleration = (Final velocity - initial velocity) / time
As the object velocity changes by the same amount in each second, it means the acceleration is constant.
Hope I can help u
5.
1
Shown above is a wire that is carrying current in a magnetic field. The magnetic field
is coming out the plane of the page.
What is the direction of deflection of the wire?
A) Upwards
B) Downwards
C) To the left
D) To the right
Answer:
The direction of defliection of the site to the left I think ..
Explain a lever and a pivot in a full sentence
Answer:
The lever is a movable bar that pivots on a fulcrum attached to a fixed point. The lever operates by applying forces at different distances from the fulcrum, or a pivot. As the lever rotates around the fulcrum, points farther from this pivot move faster than points closer to the pivot.
IF HELPED MARK AS BRAINLIEST
in the accompanying,circuit a battery with an emf of 24 v is connected in series to resistor x and two identical light bulbs connected in parallel.each light bulb is Marked 6 V and 3 w .will the ammeter reading increase or decrease if another identical light bulb is connected in parallel to the existing two and another resistor is connected in series with x? explain your answers
Answer:
Explanation:
When you put another light bulb in parallel with the other two, you are not going to get something for nothing. The current drain on the battery has to go up.
Let the lightbulbs have a a resistance of r. Two light bulbs with make the resistance go to 1/2 r. The lower the resistance, the more the current. When you put the third light bulb in, the resistance will go to 1/3 r. So the current goes up.
If you put another resistor in series with x, the resistance adds. The total series resistance is 2x. The current reading will go down. The higher the resistance the lower the current.
A car accelerates by 4 m/s^2 and travels for 2.5 mins with an initial velocity of 20m/s. Find the final velocity.
Answer:
540m/s
Explanation:
v= u + at
u change t to seconds
Please help what is the mass ??
•358.20 g
•358.3 g
•358.30 g
•358.2 g
Answer:
The answer is 358.2 g.
wat is the difference between resultance and equilibrum
Explanation:
A resultant force is the sum of the forces on an object.
Forces are said to be in equilibrium when the resultant force is zero. This means the object will not accelerate.
Give reason for the following:
a) An inflated balloon was pressed against a wall after it has been rubbed with a
piece of synthetic cloth. It was found that the balloon sticks to the wall.
b) When an object is thrown up, it comes back to ground.
c) Mountaineers suffer nose bleeding at higher altitudes.
d) Foundations of high rise buildings are kept wide.
e) Deep sea divers or high altitude fliers wear special suits.
f) Walls of a dam are thickened near the base.
a) An inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. This is because a positive and negative electric charge is produced, therefore the balloon sticks to the wall.
b) When an object is thrown up, it comes back to ground because of gravitational attraction force of earth.
c) Mountaineers suffer nose bleeding at higher altitudes because the oxygen level decreases with increase in altitude, which the body cannot adjust.
d) Foundations of high rise buildings are kept wide because more is the area of contact, less is the pressure efforts. So, foundations are wide so as to decrease the possibility of the building from falling down.
e) Deep sea divers or high altitude fliers wear special suits so as prevent their body from being crushed by the water pressure. Since water pressure is maximum at deep seas and oceans, therefore, more is the risk of being injured.
f) Walls of a dam are thickened near the base so that the dam can handle the kinetic energy pressure and prevent itself from breaking down, which if not, can lead to flooding.
HOPE IT HELPS...
a car travels in a constant speed around BCDA. Where is acceleration present
1) BC and CD
2) BC and AC
3) AB and CD
(sorry for the awk looking diagram its supposed to be all connected btw)
Answer:
3) AB and CD
Explanation:
because where velocity is constant acceleration is equal to Zero
A car has steady speed of 8m/s .How long does the car take to travel 160m
Answer:
the time taken by the car to travel 160 m = 160/8= 20 s
Hope it helps!!!!!!
Thank you
between the continental shelf and a continental rise?
volcanic island
seamount
continental slope
Answer:
continental slope
Explanation:
the continental shelf is after the land and before the continental rise as it's in the diagram of an ocean floor
in which of the following conditions would a person NOT hear an echo!100 points to the first correct awnser
Answer:
Umm well a person can not hear when a it snows or maybe like a snow storm
Explanation: snow is so light you dont hear it land but you can see it
Answer: the answer is, A sound wave reaches the ear, and the reflected wave reaches the ear less than 0.1 seconds later
Explanation: PENN
how many elements have been discovered so far?
Answer:
The answer is...
118.
118 elements have been discovered.
Hopefully, this helps you!!
[tex]AnimeVines[/tex]
Answer:
If you mean chemical elements... there are 118 elements discovered so far.
every morning Tom walks along a straight road from his home to a bus stop,a distance of 160 meters.The graph shows his journey on one particular day?
Answer:
Tom walked until he was 100 metres from his home. Then, he realised that he had dropped his homework, so he turned around and went 60 metres to pick it up again. He again turned back and started to walk faster to get to the bus stop on time. He got to the bus stop 100 seconds after leaving his home and waited for the bus.
Explanation:
State which type of variable is plotted on the x-axis
and which type is plotted on the y-axis.
Answer:
Often the independent variable is plotted on the x-axis - and example might be time (an experiment where time is measured by a watch or an independent mechanical device)
The dependent variable is often plotted on the y-axis - and example here might be the velocity or the acceleration,
It may be the responsibility of the experimenter to determine the value of the dependent variable by some type of measurement
explain why the rest of the group has metallic behavior but boron does not
Answer:
Since boron only has two electron shells, it is about as capable of gaining electrons as it is of losing electrons, so it behaves as a metalloid
Explanation:
Since boron only has two electron shells, it is about as capable of gaining electrons as it is of losing electrons, so it behaves as a metalloid. The other elements in this group have more electron shells, so it is much easier for them to lose their valence electrons and they behave like metals